Calgon patent on UV treatment of water parasite found invalid in Canada

The Federal Court of Canada found that the Calgon's Canadian patent for the use of ultraviolet light to prevent infection from a certain parasite, cryptosporidium, in drinking water is invalid. (from BusinessWeek)

Earlier in 2006, the District Court for New Jersey had found Calgon's US counterpart patent invalid, on summary judgment.

In Canada, Calgon Carbon had alleged that the City of North Bay, Ontario, Canada infringed its patent and that Trojan Technologies Inc. induced or procured North Bay's infringement.